Checking to see if one array's elements are in another array in PHP

I have two arrays in PHP as follows:

People:

Array
(
    [0] => 3
    [1] => 20
)

Wanted Criminals:

Array
(
    [0] => 2
    [1] => 4
    [2] => 8
    [3] => 11
    [4] => 12
    [5] => 13
    [6] => 14
    [7] => 15
    [8] => 16
    [9] => 17
    [10] => 18
    [11] => 19
    [12] => 20
)

How do I check if any of the People elements are in the Wanted Criminals array?

In this example, it should return true because 20 is in Wanted Criminals.

You can use array_intersect().

$result = !empty(array_intersect($people, $criminals));

There's little wrong with using array_intersect() and count() (instead of empty).

For example:

$bFound = (count(array_intersect($criminals, $people))) ? true : false;